Show the project key and custom field type for the duplicated custom fields when adding fields to a gadget

Problem

With next-gen (team managed) project, since it's independent of classic ones, we can create fields with the same name for each project. 

Also on Custom fields (System), it's possible to add the same name for fields with different types.

Suggestion

Show the project key and the field type to better identify the fields, so we can select the correct field to show when adding it to a gadget in the dashboard, for example.